Joseph, K. (2004). Essentials of environmental studies. Pearson Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJoseph, Kurian. Essentials of Environmental Studies. Delhi: Pearson Education, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJoseph, Kurian. Essentials of Environmental Studies. Pearson Education, 2004.
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